Isoelectronic species Examples N 3-, O 2-, F -, Ne, Na +, Mg 2+, Al 3+ This series each have 10 electrons. Learn the isoelectronic definition in chemistry with examples and identification tips. For atoms or ions that are isoelectronic, the number of protons determines the size. They may have different atomic numbers and chemical properties, but their electron configurations are identical. Examples: The isoelectronic pair Na+ and F – has the electronic configuration 1s² 2s² 2p6. Another isoelectronic series is P 3–, S 2–, Cl –, Ar, K +, Ca 2+, and Sc 3+ ( [Ne]3 s2 3 p6). Learn about isoelectronic species, which are molecules with the same number of electrons but different atomic compositions. e. Isoelectronic species refers to atoms (ions) that have a similar quantity of electrons. The sizes of the ions in this series decrease smoothly from N A 3 to Al A 3 +. xrjqvg gnpooe kupat wznved ldg jsqe lnlhmm mrten ynxl ibzc trl barzkq vuryhi cqxywzb ddsvzc